ISL97519A.pdf 데이터시트 (총 9 페이지) - 파일 다운로드 ISL97519A 데이타시트 다운로드

No Preview Available !

600kHz/1.2MHz PWM Step-Up Regulator
ISL97519A
The ISL97519A is a high frequency, high efficiency step-up
voltage regulator operated at constant frequency PWM mode.
With an internal 2.0A, 200mΩ MOSFET, it can deliver up to 1A
output current at over 90% efficiency. Two selectable
frequencies, 600kHz and 1.2MHz, allow trade offs between
smaller components and faster transient response. An
external compensation pin gives the user greater flexibility in
setting frequency compensation allowing the use of low ESR
Ceramic output capacitors.
When shut down, it draws <1µA of current and can operate
down to 2.3V input supply. These features, along with 1.2MHz
switching frequency, make it an ideal device for portable
equipment and TFT-LCD displays.
The ISL97519A is available in an 8 Ld MSOP package with a
maximum height of 1.1mm. The device is specified for
operation over the full -40°C to +85°C temperature range.
Features
• >90% Efficiency
• 2.0A, 200mΩ Power MOSFET
• 2.3V to 5.5V Input
• 1.1*VIN up to 25V Output
• 600kHz/1.2MHz Switching Frequency Selection
• Adjustable Soft-Start
• Internal Thermal Protection
• 1.1mm Max Height 8 Ld MSOP Package
• Pb-Free (RoHS compliant)
• Halogen Free
Applications
• TFT-LCD displays
• DSL modems
• PCMCIA cards
• Digital cameras
• GSM/CDMA phones
• Portable equipment
• Handheld devices
VDD
REFERENCE
GENERATOR
FSEL
OSCILLATOR
EN SS
SHUTDOWN
AND START-UP
CONTROL
COMPARATOR
PWM LOGIC
CONTROLLER
CURRENT
SENSE
GM
AMPLIFIER
FET
DRIVER
LX
GND
FB
COMP
February 16, 2012
FN6683.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2008, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.

No Preview Available !

Pin Configuration
ISL97519A
ISL97519A
(8 LD MSOP)
TOP VIEW
COMP 1
FB 2
EN 3
8 SS
7 FSEL
6 VDD
GND 4
5 LX
Pin Descriptions
PIN NUMBER PIN NAME
DESCRIPTION
1 COMP Compensation pin. Output of the internal error amplifier. Capacitor and resistor from COMP pin to ground.
2 FB Voltage feedback pin. Internal reference is 1.24V nominal. Connect a resistor divider from VOUT. VOUT = 1.24V (1 + R1/R2).
See “Typical Application Circuit” on page 2.
3 EN Shutdown control pin. Pull EN low to turn off the device.
4 GND Analog and power ground.
5 LX Power switch pin. Connected to the drain of the internal power MOSFET.
6 VDD Analog power supply input pin.
7 FSEL Frequency select pin. When FSEL is set low, switching frequency is set to 620kHz. When connected to high or VDD, switching
frequency is set to 1.25MHz.
8 SS Soft-start control pin. Connect a capacitor to control the converter start-up.
Typical Application Circuit
R3
1kΩ
C5
4.7nF
OPEN R1 85.2kΩ
C5
R2
10kΩ
1 COMP
2 FB
3 EN
4 GND
SS 8
FSEL 7
VDD 6
LX 5
S1
C4
27nF
C2 + C1
0.1µF 22µF
2.3V TO 5.5V
10µH
+ C3
D1 22µF
12V
Ordering Information
PART NUMBER
(Notes 2, 3)
PART
MARKING
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL97519AIUZ
7519A
8 Ld MSOP
M8.118A
ISL97519AIUZ-T (Note 1)
7519A
8 Ld MSOP
M8.118A
ISL97519AIUZ-TK (Note 1)
7519A
8 Ld MSOP
M8.118A
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL97519A. For more information on MSL please see techbrief TB363.
2 FN6683.3
February 16, 2012

No Preview Available !

ISL97519A
Absolute Maximum Ratings (TA = +25°C)
LX to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27V
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V
COMP, FB, EN, SS, FSEL to GND . . . . . . . . . . . . . . . . . . -0.3V to (VDD +0.3V)
Thermal Information
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Ambient Temperature . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+135°C
Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves on page 5
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise
noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications VIN = 3.3V, VOUT = 12V, IOUT = 0mA, FSEL = GND, TA = -40°C to +85°C unless otherwise specified.
Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
DESCRIPTION
CONDITIONS
MIN MAX
(Note 4) TYP (Note 4) UNIT
IQ1 Quiescent Current - Shutdown
EN = 0V
1 5 µA
IQ2
IQ3
VFB
IB-FB
VDD
DMAX-600kHz
DMAX-1.2MHz
ILIM1
ILIM2
IEN
rDS(ON)
ILX-LEAK
ΔVOUT/ΔVIN
ΔVOUT/ΔIOUT
FOSC1
FOSC2
VIL
VIH
GM
VDD-ON
HYS
ISS
VSS-en
ILIM-VSS-en
OTP
Quiescent Current - Not Switching
Quiescent Current - Switching
Feedback Voltage
Feedback Input Bias Current
Input Voltage Range
Maximum Duty Cycle
Maximum Duty Cycle
Current Limit - Max Peak Input Current
Current Limit - Max Peak Input Current
Shutdown Input Bias Current
Switch ON-Resistance
Switch Leakage Current
Line Regulation
Load Regulation
Switching Frequency Accuracy
Switching Frequency Accuracy
EN, FSEL Input Low Level
EN, FSEL Input High Level
Error Amp Tranconductance
VDD UVLO On Threshold
VDD UVLO Hysteresis
Soft-Start Charge Current
Minimum Soft-Start Enable Voltage
Current Limit Around SS Enable V
Over-Temperature Protection
EN = VDD, FB = 1.3V
EN = VDD, FB = 1.0V
FSEL = 0V
FSEL = VDD
VDD < 2.8V
VDD > 2.8V
EN = 0V
VDD = 2.7V, ILX = 1A
VSW = 27V
3V < VIN < 5.5V, VOUT = 12V
VIN = 3.3V, VOUT = 12V, IO = 30mA to 200mA
FSEL = 0V
FSEL = VDD
ΔI = 5µA
SS = 200mV
1.228
2.3
85
85
1.5
500
1000
1.5
70
1.95
2
40
300
0.7
3
1.24
0.01
92
90
1.0
2.0
0.01
0.2
0.01
0.2
0.3
620
1250
130
2.1
140
3
65
350
150
4.5
1.252
0.5
5.5
0.5
3
740
1500
0.5
150
2.25
4
150
400
mA
mA
V
µA
V
%
%
A
A
µA
Ω
µA
%
%
kHz
kHz
V
V
1µ/Ω
V
mV
µA
mV
mA
°C
NOTE:
4. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
3 FN6683.3
February 16, 2012

No Preview Available !

ISL97519A
Typical Performance Curves
95
90
85
VIN = 5V, VO = 12V, fs = 1.25 MHz
80
VIN = 5V, VO = 12V, fs = 620 kHz
75
70 VIN = 5V, VO = 9V, fs = 620 kHz
65 VIN = 5V, VO = 9V, fs = 1.25MHz
60
0
200 400 600 800
IOUT (mA)
FIGURE 1. BOOST EFFICIENCY vs IOUT
1000
92
VIN = 3.3V, VO = 9V,
90 fs = 620kHz
88
86
84
82
80
78
76
74
0
VIN = 3.3V, VO = 12V,
fs = 620kHz
VIN = 3.3V, VO = 12V,
fs = 1.25MHz
VIN = 3.3V, VO = 9V,
fs = 1.25MHz
100 200 300 400
IOUT (mA)
FIGURE 2. BOOST EFFICIENCY vs IOUT
500
0.9
0.8 VIN = 5V, VO = 12V,
fs = 1.25MHz
0.7
VIN = 5V, VO = 9V,
fs = 1.25MHz
0.6 VIN = 5V, VO = 9V,
0.5 fs = 620kHz
0.4
0.3
0.2
0.1
0
0
VIN = 5V, VO = 12V,
fs = 620kHz
200 400 600
800
IOUT (mA)
FIGURE 3. LOAD REGULATION vs IOUT
1000
0.7
VIN = 3.3V, VO = 12V,
0.6 fs = 1.25MHz
0.5
0.4
0.3
VIN = 3.3V, VO = 9V,
fs = 1.25MHz
VIN = 3.3, VO = 9V,
fs = 620kHz
0.2
0.1
0
0
VIN = 3.3, VO = 12V,
fs = 620kHz
100 200 300 400
IOUT (mA)
FIGURE 4. LOAD REGULATION vs IOUT
500
0.6
0.5 VO = 9V, IO = 80mA
fs = 1.25MHz
0.4 VO = 9V, IO = 100mA
fs = 620kHz
0.3
VO = 12V, IO = 80mA
0.2 fs = 1.25MHz
0.1
0
-0.1
2
VO = 12V, IO = 80mA
fs = 620kHz
345
VIN (V)
FIGURE 5. LINE REGULATION vs VIN
4
6
VO = 12V
IO = 50mA TO 300mA
VIN = 3.3V
fs = 600kHz
FIGURE 6. TRANSIENT RESPONSE
FN6683.3
February 16, 2012

No Preview Available !

ISL97519A
Typical Performance Curves (Continued)
VO = 12V
IO = 50mA to 300mA
VIN = 3.3V
fs = 1.2MHz
FIGURE 7. TRANSIENT RESPONSE
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
1.0
0.9
0.8 870mW
0.7
0.6
0.5
0.4
θJA = +1M1S5O°CP/W8
0.3
0.2
0.1
0
0
25
50
75 85 100
125
AMBIENT TEMPERATURE (°C)
FIGURE 9. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
Applications Information
The ISL97519A is a high frequency, high efficiency boost
regulator operated at constant frequency PWM mode. The
boost converter stores energy from an input voltage source
and delivers it to a higher output voltage. The input voltage
range is 2.3V to 5.5V and output voltage range is 5V to 25V.
The switching frequency is selectable between 600kHz and
1.2MHz allowing smaller inductors and faster transient
response. An external compensation pin gives the user greater
flexibility in setting output transient response and tighter load
regulation. The converter soft-start characteristic can also be
controlled by external CSS capacitor. The EN pin allows the
user to completely shutdown the device.
Boost Converter Operations
Figure 11 shows a boost converter with all the key
components. In steady state operating and continuous
conduction mode where the inductor current is continuous, the
5
FIGURE 8. SS DELAY AND LX DELAY DURING EN = VDD
START- UP
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
0.6
0.5
486mW
0.4
0.3
0.2
θJA = +2M0S6O°CP/8W
0.1
0.0
0
25 50 75 85 100
AMBIENT TEMPERATURE (°C)
125
FIGURE 10. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
boost converter operates in two cycles. During the first cycle,
as shown in Figure 12, the internal power FET turns on and the
Schottky diode is reverse biased and cuts off the current flow
to the output. The output current is supplied from the output
capacitor. The voltage across the inductor is VIN and the
inductor current ramps up in a rate of VIN/L, L is the
inductance. The inductance is magnetized and energy is stored
in the inductor. The change in inductor current is shown in
Equation 1:
ΔIL1 = ΔT1 × V---L-I--N--
ΔT1 = -F---SD---W---
D = Duty Cycle
ΔVO = C-I--O-O---U-U---T-T × ΔT1
(EQ. 1)
FN6683.3
February 16, 2012